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, as to location.

UNITED STATES FHILIIE J. ERNENWEIN, 0F NEW YGRK, N. Y.

RUBBER TIRE.

Speeication of Letters Patent.

Patented Nov. 30, 1920.

Application led November 8, 1919. Serial No. 336,541.

To all whom t may concern:

.lie it known that I, PHILIP J. ERNENWBIN, a citizen of the United States, residing at 306 West 47th street, borough of Manhattan, city of New York, N. Y., have invented an Improvement in Rubber Tires, of which the following is a specification.

My invention relates more particularly to the type of tires known solid rubber tires of large sizes, such as are used on trucks and other similar vehicles vfor carrying heavy loads. Many tires of this type have recesses or openings in the outer surface to relieve the strain in the rubber resulting from the Wave movement inherent in tires of this type when in use, and also for traction purposes, and many different forms ot' openings, pockets and recesses are in use with such tires under various arrangements I have found however that better results are obtained when the mass of rubber in the tire stands in proper rela.

tion to the size and location of the openings, as these features and also the shape of the openings materially effect the wearing quality of the tire; best results will obtain Where' openings are provided of proper shape, and location so that all parts of the rubber may have a chance to expand when under pressure of the load, nearly equal as possible.

To accomplish this I provide a tire with unconnected, -transverse side and central openings, also a longitudinal central opening, the Width of the latter/should vary with the height of the tire, and also the size of the openings or pockets will be in pro ortito the Widths and height of the ru ber portion of the tire the prime object being' to use the largest mass of rubber possible leaving suiiicient space for expansion of all parts when `under pressure; in the small sizes of tires this longitudinal opening may be very narrow. In a twelve inch tire ot medium height, the central opening should be from to of an inch in Width andthe transverse pockets about 1 inch in width spaced about 3 to 4 inches apart from center to center. All these openings must have considerable depth that the central portions of the rubber may have space for expansion.

ln the annexed drawings Figure l, is a top plan view of a fragment of a tire embodying my invention. Fig. it, is a view of such tire in cross section. l `ig. El, is a modi fication oi' liig. 2. the longitudinal opening being omitted. Like numerals refer to like parts in all figures.

The rubber portion of the tire 4, is secured to a metal base rim 5, by any ot' the Well known means now in common use. This metal base rim in .turn is secured to the felly of the wheel. In the rubber portions are transverse side openings SW6, and

'transverse central pockets or openings 7-7 and a longitudinal opening 8 which extends entirely around the tire.

In the smaller agd sballower tires the central opening may be of comparatively small width. or in very small or shallow tires may be really omitted as shown in Fig. 3, leaving the pockets or openings to take care of the expansion of the rubber.

l'l'aving described my invention, I claim-- lira rubber tire ol the character de` scribed, a metal base rim, a continuous rubber band vulcanized to said base rim, said band having a central open channel rela tively deep extending circumferentially entirely around said band and dividing the tread portion thereof into counterparts, each counterpart havin on its exterior edge a plurality of relativey deep recesses extending from the exterior Walls transversel to points in the tread portions of sai counterparts short of said central. channel, said counterparts also having on their 1nterior edges a plurality ci Yrelatively deep notches extendingufrom seid central channel transversely to points in the tread portions of said counterparts short of the ev terior walls thereof. e

PHILIP J. ERNFT VV EIN. 

